278768742 has 48 divisors (see below), whose sum is σ = 663676992. Its totient is φ = 77792400.

The previous prime is 278768639. The next prime is 278768753. The reversal of 278768742 is 247867872.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1617 + ... + 23667.

It is an arithmetic number, because the mean of its divisors is an integer number (13826604).

Almost surely, 2^278768742 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 278768742, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (331838496).

278768742 is an abundant number, since it is smaller than the sum of its proper divisors (384908250).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

278768742 is a wasteful number, since it uses less digits than its factorization.

278768742 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22113 (or 22106 counting only the distinct ones).

The product of its digits is 2107392, while the sum is 51.

The square root of 278768742 is about 16696.3691262502. The cubic root of 278768742 is about 653.2529181071.

The spelling of 278768742 in words is "two hundred seventy-eight million, seven hundred sixty-eight thousand, seven hundred forty-two".